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Unknown Problem

OK I am going to try and explain this the best I can:
I have a zone that is like a "T" on the left side of the "T" is 3 rotors, on the right side of the "T" is 2 rotors.
When I turn the zone on the 5 rotors barely come up. If I go pull two heads up by hand then all of a sudden I have pressure in all of them and they will work normal.
If I cut off the right side off with left side on of the "T" and just have the left side working the three come up just fine.
If I cut off the left side off with right side on of the "T" and just have the right side working the two come up just fine.
But when I turn the whole zone on they don't come up all the way.
There is no leaks, no blockages, and I changed the valve.
PLEASE HELP I AM VERY FRUSTRATED
Thank You!